Polyamide-imide precursor, polyamide-imide film and display device comprising same
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United States of America Patent
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May 26, 2020
Grant Date -
Jan 4, 2018
app pub date -
Dec 30, 2015
filing date -
Dec 30, 2014
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Abstract
This 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, and a second block, obtained by copolymerizing monomers including an aromatic dicarbonyl compound and aromatic diamine. The dianhydride includes biphenyltetracarboxylic acid dianhydride (BPDA) and 2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA), and the diamine includes bistrifluoromethylbenzidine (TFDB).
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