Patent ID: 6099758
Filing Date: 2000-08-08
Classification: C09K,G02B,G02F

Abstract:
A broadband reflective polarizer comprising a layer of a polymerized mesogenic material exhibiting a helically twisted molecular structure with planar alignment, said reflective polarizer being obtained by a process wherein a mixture of a chiral polymerizable mesogenic material comprisinga) at least one achiral polymerizable mesogenic compound,b) at least one chiral compound which is optionally polymerizable and/or mesogenic, andc) a polymerization initiator,is coated on a substrate or between two substrates in form of a layer, aligned in a planar orientation so that the axis of the molecular helix extends transversely to the layer, and polymerized by exposure to heat or actinic radiation, and optionally the substrates are removed from the polymerized material, whereinsaid polymerizable material is coated and polymerized between two different substrates, and/orat least one substrate comprises a barrier layer on the surface adjacent to the layer of said polymerizable material.