Polyamide-imide-based film, preparation method thereof, and cover window and display device comprising the same

Abstract

This embodiment aims to provide a polyamide-amide-imide membrane comprising a fluorine-free polyamide-amide-imide polymer, wherein the polyamide-amide-imide polymer comprises an amide-imide repeating unit, a first amide-imide repeating unit, and a second amide-imide repeating unit, and wherein the amide-imide repeating unit is defined as follows: when the sum of the amide-imide repeating unit, the first amide-imide repeating unit, and the second amide-imide repeating unit is 100 mol%, the amide-imide content is... The molar ratio of the repeating unit is 40 molar% or less, the molar ratio of the first amide repeating unit is 70 molar% or less, and the sum of the molar ratios of the first amide repeating unit and the second amide repeating unit is 60 to 97 molar%, thereby the film has excellent optical and mechanical properties, UV blocking ability and solvent resistance, providing a process for preparing the film, and providing a cover window and display device including the film. The embodiments aim to provide a polyamide-imide-based film, which comprises a polyamide-imide-based polymer that is free of fluorine atoms, wherein the polyamide-imide-based polymer comprises an imide-based repeat unit, a first amide-based repeat unit, and a second amide-based repeat unit, and when the sum of the imide-based repeat unit, the first amide-based repeat unit, and the second amide-based repeat unit is 100% by mole, the molar ratio of the imide-based repeat unit is 40% by mole or less, the molar ratio of the first amide-based repeat unit is 70% by mole or less, and the sum of the molar ratios of the first amide-based repeat unit and the second amide-based repeat unit is 60 to 97% by mole, whereby the film has excellent optical and mechanical properties, UV blocking capability, and solvent resistance, to a process for preparing the same, and to a cover window and a display device comprising the same.

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