Patent ID: 7638185
Filing Date: 2009-12-29
Classification: B32B,G02B,Y10T

Abstract:
1. An optical film comprising a transparent substrate and at least one coating coated on the surface of the substrate, wherein the coating consists essentially of a polymeric matrix and inorganic nano particles and the optical film has a light-focusing structure, wherein the coating forms a plurality of prisms with each of the prisms comprising a prism peak, the inorganic nano particles being present in the coating in an amount effective to increase the hardness of the prism peaks so as to inhibit collapse of the light-focusing structure, wherein the polymeric matrix is obtained by (a) polymerizing monomers selected from the group consisting of halogenated epoxy diacrylate, methyl methacrylate, 2-phenoxy ethyl acrylate, and mixtures thereof to form a UV-light curable polymer and (b) curing the UV-light curable polymer by exposure to UV light, wherein the coating forms a plurality of prisms with each of the prisms comprising a prism peak, the inorganic nano particles being present in the coating in an amount effective to increase the hardness of the prism peaks as compared to the hardness of the prism peaks without the nano particles being present.