Optical films including modified copolyesters

摘要

The application relates to a multilayered polymer film, comprising:
a plurality of first optical layers comprising a birefringent first copolyester or polyester; and
a plurality of second optical layers comprising a second copolyester being a copolyester and polycarbonate polymer blend and having an in-plane birefringence of 0.04 or less at 632.8 nm, after the multilayered polymer film has been formed.