Patent ID: 8123987

Claim:
A photochromic curable composition comprising a polymerizable monomer; a chromene compound represented by the following formula (1) wherein R 1 and R 2 are independently hydrogen atoms, hydroxyl groups, alkyl groups, cycloalkyl groups, alkoxy groups, aralkyl groups, aralkoxy groups or aryl groups and optionally R 1 and R 2 are bonded together to form a ring or R 3 and R 4 are bonded together to form a ring, (a) R 1 and R 3 or R 4 are groups independent from each other, and R 2 and R 3 or R 4 are groups independent from each other; and (b) R 3 and R 4 are independently hydroxyl groups, alkyl groups, cycloalkyl groups, alkoxy groups, aralkyl groups, aralkoxy groups or aryl groups, R 5 , R 6 , R 7 and R 8 are independently, hydroxyl groups, alkyl groups, cycloalkyl groups, alkoxy groups, aralkyl groups, aralkoxy groups, aryl groups, amino groups, substituted amino groups, cyano groups, nitro groups, halogen atoms, halogenoalkyl groups or halogenoalkoxy groups, and when two R 6 are bonding to adjacent carbon atoms, bonded two group R 6 may form 1,3-dioxolan ring or 1,4-dioxane ring and these rings may have an alkyl group as a substituent, m and n are independently, integers of 0 to 4, and x and y are independently, integers of 0 to 5; and a photopolymerization initiator.