Patent ID: 7479309
Filing Date: 2009-01-20
Classification: C09K,G02B,G02F

Abstract:
1. A multilayer compensator comprising: one or more polymeric first layers; and one or more polymeric second layers, wherein the first layers comprise a polymer having an out-of-plane birefringence (Δn wherein the second layers comprise an amorphous polymer having an outof-plane birefringence more negative than −0.005 or more positive than +0.005; wherein the term “amorphous ” means that the polymer does not show molecular order as measured by the absence of sharp peaks in the X-ray diffraction data; wherein the overall magnitude of the in-plane retardation (R (a) more negative than −20 nm, in which case the amorphous polymer of the one or more second layers contains in the backbone a non-visible chromophore group and has a glass transition temperature (Tg) such that 110° C.≦Tg≦180° C., or (b) more positive than +20 nm, in which case the amorphous polymer of the one or more second layers includes off the backbone a non-visible chromophore group and has a glass transition temperature (Tg) such that 110° C.≦Tg≦160° C.; and wherein at least one of the one or more polymeric first layers and at least one of the one or more polymeric second layers are contiguous.