POLYESTER FILM FOR MOLD RELEASE FILM

摘要

PROBLEM TO BE SOLVED: To provide a polyester film which is suitable for a base film for a mold release film which enables the execution of a precise checkup on the occasion of the checkup of a polarizing plate by a so-called cross Nicol's prism method.

SOLUTION: A biaxially oriented polyester film for the mold release film has variations in the angle of orientation at 3°/500 mm or below, the heat shrinkage factor in 30 minutes at 150°C by 5% or below and the strength (F5) in 5% extension at 100 MPa or above.

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