申请人:Wang Lei
公开号:US08854730B2
公开(公告)日:2014-10-07
Presently described are multilayer optical films, oriented polyester films, negatively birefringent copolyester polymers, fluorene monomers, and polyester polymers prepared from such fluorene monomers. In one embodiment, the multilayer optical film comprises at least one first birefringent optical layer; and at least one second optical layer having a lower birefringence than the first optical layer; wherein at least one of the optical layers comprises a negatively birefringent polyester polymer comprising a backbone and repeat units comprising at least one pendent aromatic group that is conformationally locked relative to the backbone.
本发明涉及多层光学薄膜、取向聚酯薄膜、负双折射共聚酯聚合物、芴单体和由此类芴单体制备的聚酯聚合物。在一种实施例中,多层光学薄膜包括至少一层第一双折射光学层;和至少一层第二光学层,其比第一光学层具有更低的双折射率;其中至少其中一层光学层包括负双折射聚酯聚合物,该聚酯聚合物包括骨架和重复单元,其中至少有一个突出的芳香基与骨架相对构象锁定。