| CPC C08J 5/18 (2013.01) [B32B 27/281 (2013.01); C08G 69/32 (2013.01); C08G 73/1039 (2013.01); C08G 73/1067 (2013.01); C08G 73/1078 (2013.01); C08G 73/14 (2013.01); B32B 2307/412 (2013.01); B32B 2307/51 (2013.01); B32B 2457/20 (2013.01); C08J 2377/06 (2013.01); C08J 2379/08 (2013.01)] | 9 Claims |
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1. A polyamide-based film, which comprises a polyamide-based polymer,
wherein the polyamide-based polymer comprises an amide-based repeat unit and an imide-based repeat unit at a molar ratio of 99:1 to 95:5,
wherein the amide-based repeat unit comprises a first amide-based repeat unit derived from a first dicarbonyl compound and a second amide-based repeat unit derived from a second dicarbonyl compound, and the angle between the two carbonyl groups contained in the first dicarbonyl compound is greater than the angle between the two carbonyl groups contained in the second dicarbonyl compound,
wherein the molar ratio of the first amide-based repeat unit and the second amide-based repeat unit is 60:40 to 75:25,
wherein the polyamide-based film has an in-plane retardation (Ro) of 800 nm or less and a thickness direction retardation (Rth) of 5,000 nm or less,
wherein the polyamide-based film has a yellow index of 2.3 or less, and
wherein the plasticity characteristic value represented by the following Equation 1 is 18.45 to 19.97%, and the elasticity characteristic value represented by the following Equation 2 is 67 to 69.5%:
Plasticity characteristic value (%)=(100−nIT)/(HIT/HM) [Equation 1]
Elasticity characteristic value (%)=nIT/{EIT/(EIT+HIT)} [Equation 2]
in Equations 1 and 2, nIT, HIT, HM, and EIT are measured according to the ISO 14577 standard with a nanoindenter, nIT is the elasticity (%), HIT is the indentation hardness (N/mm2), HM is the composite hardness (N/mm2), and EIT is the indentation modulus (GPa).
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