Patent ID: 9625629
Date: 2017-04-18
CPC Classifications: G02B

Claim:
1. A process for producing an optically anisotropic film, wherein the following steps (A) and (B) are carried out in order: (A) a step of applying a composition for forming an optically anisotropic film to a substrate, the composition comprising a photopolymerization initiator, a solvent and a polymerizable liquid crystal compound having a maximum absorption wavelength in a range of 250 nm to 370 nm, and (B) a step of applying light with an allowable variation range of less than 250 nm in a wavelength range of 200 nm to 500 nm, wherein the film satisfying the following formulae (1) and (2): wherein Δn(450), Δn(550) and Δn(650) represent birefringence indices for lights with wavelengths of 450 nm, 550 nm and 650 nm, respectively.