| abstract |
The present invention relates to an optical biaxially oriented polyester film, and more particularly, to an optically functional coating process having a uniform adhesive force after processing of a substrate and a functional optical coating such as a prism, adhesion, or hard coating. The present invention relates to a biaxially oriented polyester film for optics, which can prevent oligomer precipitation by heat treatment so that it can be usefully used, thereby maintaining transparency and achieving high quality by securing product productivity and reducing defect rate. |