| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyester laminated film excellent in gas barrier properties, heat resistance, water resistance, blocking properties and easy adhesiveness and useful for a packing material or a printing material. SOLUTION: One layer comprises polyester based on naphthalenedicarboxylic acid and 1,3-propanediol and a surface layer comprises copolyester satisfying formulae: 40<=A+B<=99, 0<C<=5, 0<=D<=60, 40<=E+F<=100 and 0<=G<=60 (wherein A, B, C and D are molar ratios of aromatic dicarboxylic acids having groups of 2,6-naphthalenedicarboxylate, terephthalate and sulfonate and other aromatic dicarboxylic acids to all of dicarboxylic acid components and E, F and G are molar ratios of lower alkylene oxide adducts of ethylene glycol, tetramethylene glycol and bisphenol A to all of glycol components and a unit is mol%).
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