METHOD FOR PRODUCING CIRCULARLY POLARIZED LIGHT ISOLATION SHEET, AND APPARATUS FOR COATING FILM FORMATION

摘要

Provided are a method for producing a circular polarization separation sheet and an apparatus for coating layer formation, whereby a circular polarization separation sheet which selectively reflects a light in an entire visible light range is easily obtainable. A method for producing a circular polarization separation sheet including a step of obtaining on a substrate a photopolymerizable composition containing a liquid crystal compound, and a step of converting the coating layer into a resin layer having a cholesteric regularity, characterized in that the resin layer forming step includes: a selected ultraviolet light irradiation step (1) of irradiating the coating layer with a selected ultraviolet light having an illumination intensity of less than 10 mW/cm 2 under a temperature at 20 to 40°C for 0.1 to 6 seconds; a cholesteric regularity adjustment step (2) of changing a cycle of the cholesteric regularity in the coating layer; and a coating layer curing step (3) of curing the coating layer to form the resin layer having the cholesteric regularity, wherein the selected ultraviolet light irradiation step (1) and the cholesteric regularity adjustment step (2) are repeated more than once.