	US 12,351,685 B2
	Polyamide acid, polyimide, optical film, display device and production methods thereof
Hiroshi Eguchi, Kawagoe (JP); Ayumi Yamaguchi, Kawagoe (JP); Yukari Hara, Kawagoe (JP); Kei Matsunaga, Kawagoe (JP); Hiroto Hori, Kawagoe (JP); Yosuke Murakami, Kawagoe (JP); Kensuke Hirotaki, Kawagoe (JP); and Kenji Hosoi, Kawagoe (JP)
Assigned to Central Glass Company, Limited, Ube (JP)
Appl. No. 17/428,860
Filed by Central Glass Company, Limited, Ube (JP)
PCT Filed Feb. 3, 2020, PCT No. PCT/JP2020/003969 § 371(c)(1), (2) Date Aug. 5, 2021, PCT Pub. No. WO2020/162411, PCT Pub. Date Aug. 13, 2020.
Claims priority of application No. 2019-019823 (JP), filed on Feb. 6, 2019.
Prior Publication US 2022/0119595 A1, Apr. 21, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C08G 73/10 (2006.01); C07B 61/00 (2006.01); C07C 17/266 (2006.01); C07C 17/32 (2006.01); C07C 22/08 (2006.01); C07C 37/20 (2006.01); C07C 37/62 (2006.01); C07C 39/16 (2006.01); C07C 41/30 (2006.01); C07C 43/225 (2006.01); C07C 45/63 (2006.01); C07C 201/12 (2006.01); C07C 205/22 (2006.01); C07C 209/78 (2006.01); C07C 211/56 (2006.01); C07C 213/08 (2006.01); C07C 215/80 (2006.01); C08G 73/12 (2006.01); C08J 5/18 (2006.01)

CPC C08G 73/1039 (2013.01) [C07C 17/32 (2013.01); C07C 22/08 (2013.01); C07C 37/62 (2013.01); C07C 39/16 (2013.01); C07C 41/30 (2013.01); C07C 43/225 (2013.01); C07C 201/12 (2013.01); C07C 205/22 (2013.01); C07C 209/78 (2013.01); C07C 211/56 (2013.01); C07C 213/08 (2013.01); C07C 215/80 (2013.01); C08G 73/1028 (2013.01); C08G 73/1078 (2013.01); C08G 73/123 (2013.01)]

26 Claims

1. A polyimide having a repeating unit represented by General Formula [1], with the proviso that a polyimide having a repeating unit represented by General Formula [3] is excluded:

wherein, in General Formula [1], R¹is a divalent organic group represented by General Formula [2], and R²is a tetravalent organic group, and

wherein, in General Formula [2], n is an integer of 1 to 4, and R³each independently represents an alkyl group.