Patent ID: 8236387

Claim:
A process of producing a patterned birefringent product, which comprises at least the following steps [1] to [3] in order: [1] preparing a birefringence pattern builder which comprises an optically anisotropic layer comprising a polymer that has an unreacted reactive group, wherein the optically anisotropic layer is a layer formed by coating with a solution comprising a liquid crystalline compound having two or more types of reactive groups which have different polymerization conditions from each other, and drying the solution to thereby form a liquid crystal phase, and then applying heat or irradiating ionized radiation to the liquid crystal phase for polymerization and fixation, said optically anisotropic layer has a retardation disappearance temperature in the range higher than 20° C., at said retardation disappearance temperature in-plane retardation becomes 30% or lower of the retardation at 20° C. of the same optically anisotropic layer, and said retardation disappearance temperature rises by light exposure; [2] subjecting the birefringence pattern builder to patterned light exposure; [3] heating the birefringence pattern builder obtained after the step [2] at 50° C. or higher and 400° C. or lower.