BIAXIALLY ORIENTED POLYESTER FILM FOR MOLD RELEASE, AND RELEASE FILM USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a biaxially oriented polyester film for mold release and a release film using the same.;SOLUTION: To provide a biaxially oriented polyester film for mold release and also a release film, wherein an oriented angle difference among 2 m length in a width direction is 3° or less and a birefringence ratio is 0.05 or more. The biaxially oriented polyester film for mold release has a high birefringence ratio and is excellent in an oriented angle by reducing bowing by stretching and thus leaking of gloss and gloss itself upon inspection of its defects using a polarized board can be controlled.;COPYRIGHT: (C)2011,JPO&INPIT