Patent ID: 9174368
Filing Date: 2015-11-03
Classification: B29C,B29K,C09D,C09K,G02B,G02F

Abstract:
1. A retardation film comprising: only one type of a resin component, wherein the only one type of resin component is either an epoxy resin cured product or an epoxy (meth)acrylate resin cured product, wherein an in-plane birefringence index of the retardation film at a wavelength of 590 nm is 0.001 or more and a birefringence index in a thickness direction thereof at a wavelength of 590 nm is 0.001 or more, the retardation film is a stretched film, and an index ellipsoid of the retardation film satisfies one of the relationships of nx>ny>nz, nx>nz>ny, or nx>ny=nz, wherein nx represents refractive index in the direction in which in-plane refractive index of the retardation film is maximum (X axial direction), ny represents refractive index in the direction orthogonal to the X axial direction in the same plane (Y axial direction), and nz represents refractive index in the direction orthogonal to the X axial direction and Y axial direction (thickness direction), and the in-plane birefringence index is determined from the expression: Δn