Polyimide-based polymer film, substrate for display device, and optical device using the same
AssigneeLG Chem, Ltd.
InventorsMin Wook Lee, Kyunghwan Kim, Chan Hyo Park
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Abstract
The present disclosure relates to a polyimide-based polymer film comprising a polyimide-based polymer containing a polyimide repeating unit synthesized by the reaction of an acid anhydride compound having a specific structure and a diamine compound, wherein a glass transition temperature is 400° C. or more, and a thickness direction retardation value at a thickness of 10 μm is 150 nm or less, and a substrate for a display device and an optical device using the same.
Claims19
A polyimide-based polymer film comprising a polyimide-based polymer containing a polyimide repeating unit represented by the following Chemical Formula 1,
- wherein a glass transition temperature is 400° C. or more, and
- a thickness direction retardation value at a thickness of 10 μm is 150 nm or less:
- wherein, in the Chemical Formula 1,
- X1 is a tetravalent functional group, and
- Y1 is an aromatic divalent functional group having 24 or more carbon atoms in which at least one electron-withdrawing functional group is substituted, and
- wherein in the Chemical Formula 1, Y1 is substituted with 1 to 3 electron-withdrawing functional groups.
Dependencies are inferred from the claim text.