	US 11,851,565 B2
	Method of preparing composition for forming polyimide film, composition for forming polyimide film prepared therefrom, and use thereof
Cheol Min Yun, Daejeon (KR); and Hye Jin Park, Daejeon (KR)
Assigned to SK Innovation Co., Ltd., Seoul (KR); and SK ie technology Co., Ltd., Seoul (KR)
Filed by SK Innovation Co., Ltd., Seoul (KR); and SK ie technology Co., Ltd., Seoul (KR)
Filed on Aug. 29, 2022, as Appl. No. 17/897,365.
Claims priority of application No. 10-2021-0114438 (KR), filed on Aug. 30, 2021.
Prior Publication US 2023/0075497 A1, Mar. 9, 2023
Int. Cl. C08L 79/08 (2006.01); C08J 5/18 (2006.01); B32B 27/28 (2006.01); B32B 27/20 (2006.01); B82Y 30/00 (2011.01)

CPC C08L 79/08 (2013.01) [B32B 27/20 (2013.01); B32B 27/281 (2013.01); C08J 5/18 (2013.01); B32B 2264/102 (2013.01); B32B 2264/301 (2020.08); B32B 2307/4026 (2013.01); B32B 2307/412 (2013.01); B32B 2457/20 (2013.01); B82Y 30/00 (2013.01); C08J 2379/08 (2013.01); C08K 2201/005 (2013.01)]

18 Claims

1. A method of preparing a composition for forming a polyimide film, the method comprising:

adding a pigment dispersion comprising a blue-based inorganic pigment having a maximum absorption wavelength of 520 to 650 nm and a dispersing agent to an organic solvent to form a mixed solution, wherein an average particle size of the inorganic pigment in the pigment dispersion is 10 to 95 nm;

dissolving a diamine in the mixed solution;

reacting a dianhydride with the diamine in the mixed solution to form a polyamic acid resin; and

adding a polyfunctional (meth)acryl-based compound after forming the polyamic acid resin.