| abstract |
A barrier film comprising a polyester-based polymer with (a) an O 2 gas permeability of 0.25 cc-mil/100 in. 2 24 hrs atm (5 cc 20 µm/m 2 24 hrs atm) at 80% relative humidity (ASTM D-3985) or less, (b) a moisture permeability of 0.5 g-mil/ 100 in. 2 24 hrs atm (9.8 g 20 µm/m2 24 hrs atm) at 38℃ (ASTM F-1249) or less, (c) haze of 1% or less (ASTM D1003), and (d) a glass transition temperature of 100℃ or higher. The polyester-based polymer may comprise reaction product of (a) one or more diacid or diester thereof, and (b) one or more polyol, wherein component (a) comprises 5 to 100 mole%, based on the total amount of component (a), of 2,5-furan dicarboxylic acid, or one or more C 1 to C 10 alkyl diester thereof, and component (b) comprises ethylene glycol, a mixture of 1,3-cyclohexanedimethanol and 1,4-cyclohexanedimethanol, or 2,2,4,4-tetramethyl-1,3-cyclobutanediol, or combinations thereof. |