PROCESS FOR PRODUCING CURED PHOTOCHROMIC

摘要

A process in which polymerization can be easily completed in a short time to give a cured object having excellent photochromism. A photopolymerizable composition comprising (A) a radical-polymerizable monomer, (B) an ultraviolet-sensitive polymerization initiator which has main absorption in the ultraviolet region and has a molar extinction coefficient of 150 liters/(mol cm) or higher for light having a wavelength of 400 nm, (C) a thermal-polymerization initiator, e.g., one having a 10-hour half-life temperature of 60 DEG C or higher, and (D) a photochromic compound is irradiated with actinic energy rays having as the main spectrum an emission spectrum having a wavelength of 400 nm or longer to conduct photopolymerization preferably in such a manner that the composition being cured does not heat up to 50 DEG C or higher. Thereafter, the composition is further heated to conduct thermal polymerization.