公开(公告)号：US11130844B2

公开(公告)日：2021-09-28

申请号：US15540803

申请日：2015-12-31

Applicant: KOLON INDUSTRIES, INC.

Inventor： Jong Won Yang ,  Hak Gee Jung

IPC: C08G73/14 ,  C08J5/18 ,  C08G81/00 ,  C08G73/10

Abstract: The present invention relates to a polyamide-imide precursor, a polyamide-imide obtained by imidizing the same, a polyamide-imide film, and an image display device including the film. The polyamide-imide precursor includes, in a molecular structure thereof, a first block, obtained by copolymerizing monomers including dianhydride and diamine, a second block, obtained by copolymerizing monomers including an aromatic dicarbonyl compound and the diamine, and a third block, obtained by copolymerizing monomers including the aromatic dicarbonyl compound and aromatic diamine. The dianhydride for forming the first block includes 2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA), and the diamine for forming the first block and the second block includes 9,9-bis(3-fluoro-4-aminophenyl)fluorene (FFDA).