Patent ID: 6048627
Filing Date: 2000-04-11
Classification: C08G,C08J,G03C,G11B,Y10S,Y10T

Abstract:
A biaxially oriented film which is made substantially of(1) a polyethylene naphthalate copolymer comprising ethylene naphthalate unit in an amount of 92 to 99.5 mol % based on all recurring units and at least one copolymer component selected from the group consisting of (a) a glycol having a fluorene skeleton in the molecule, (b) p-hydroxymethylbenzoic acid, (c) p-hydroxyethoxybenzoic acid and (d) p-hydroxyethoxybenzoic acid in an amount of 0.5 to 8 mol % based on the total of all dicarboxylic acid components, said polyethylene naphthalate copolymer comprising a diethylene glycol component in an amount of 3 mol % or less based on the total of all dicarboxylic acid components and which has(2) Young's moduli in both longitudinal and transverse directions of 500 kg/mm.sup.2 or more and (3) a delamination resistance of 10% or less in terms of fold line whitening ratio.