Being the polarizer conservation film null biaxial oriented Polyethylene terephthalate film which

摘要

PROBLEM TO BE SOLVED: To provide a biaxially oriented polyethylene terephthalate film having excellent dimensional stability and transparency, capable of reducing rainbow-like unevenness even at a wide viewing angle, and suitable for a polarizer protective film.;SOLUTION: The biaxially oriented polyethylene terephthalate film comprises polyethylene terephthalate including ethylene glycol and terephthalic acid as structural components. The film has a haze of 7.0% or less, a thermal shrinkage rate of 4.0% or less at 150°C, a retardation of 1800 nm or less, variation in the retardation of 400 nm/m or less in a film width direction, and a plane orientation coefficient ΔP of the film of 0.1655 to 0.175, and the film is used for a polarizer protective film. However, the present invention excludes polyethylene terephthalate containing a third component other than the chief structural components.;COPYRIGHT: (C)2012,JPO&INPIT