DIFFUSE REFLECTIVE POLARIZIING FILMS WITH ORIENTABLE POLYMER BLENDS

摘要

A polarizing film (4) includes a first phase (6) of a first polymer having a birefringence of at least 0.05 and a second phase (8) of a second polymer disposed within the first phase (6). The index of refraction difference between the first (6) and second (8) phases is greater than about 0.05 along a first axis and is less than about 0.05 along at least one axis orthogonal to the first axis. The diffuse reflectivity of the first (6) and second (8) phases taken together along at least one axis for at least one polarization state of electromagnetic radiation may be at least about 30%. In some exemplary embodiments, the second phase (8) has a refractive index of about 1.53 to about 1.59. In some exemplary embodiments, the second polymer has a glass transition temperature (Tg) higher than the Tg of the birefringent first polymer.