Isotropic layer of multilayer optical film comprising birefringent thermoplastic polymer

摘要

Multilayer optical films are described comprising at least one first optical layer comprising a birefringent thermoplastic polymer having an in-plane birefringence of at least 0.15 at 632.8 nm; and at least one second optical layer having an in-plane birefringence of less than 0.040 at 632.8 nm. The second optical layer comprises a copolymerized blend of at least one birefringent thermoplastic polymer and at least one second thermoplastic polymer.