Patent ID: 8709553
Filing Date: 2014-04-29
Classification: C09K,G02B

Abstract:
1. A patterned birefringent product comprising a patterned optically anisotropic layer having two or more regions of different birefringence in the form of a pattern, which further comprises a semi-transmissive-half-reflective layer having a transmittance of 30% or higher and a reflectance of 30% or higher, and a protective layer with a refractive index of 1.4 to 1.7, wherein the product comprises the semi-transmissive-half-reflective layer, the patterned optically anisotropic layer, and the protective layer in this order, wherein the regions of different birefringence are regions of different retardation, wherein the thickness of the protective layer is in the range from 40 to 200 micrometers, wherein the semi-transmissive-half-reflective layer which has the transmittance of 30% or higher and the reflectance of 30% or higher is disposed only at one side of the patterned optically anisotropic layer, and wherein the patterned birefringent product permits the visual recognition of the birefringence pattern, through a polarizing plate or another device used for observation of the pattern, from the side of the protective layer.